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Respiration
Respiration is the process by which food is burnt
in the cells of the body with the help of oxygen to
release energy. It takes place in the mitochondria
of the cells. Respiration involves the exchange of
gases and oxidation of food in the presence of air
to release energy. Inhalation and exhalation of air
occur due to change in air pressure in lungs
.Diffusion helps in exchange of gases in lungs and
tissues.
There are two main types of respiration. They are aerobic and anaerobic
    respiration.
i) Aerobic respiration :- Takes place in the presence of oxygen. It produces more
    energy. The end products are carbon dioxide, water and energy. It takes
    place in most organisms. In aerobic respiration glucose is converted into
    pyruvate in the cytoplasm in the presence of oxygen and then in the presence
    of oxygen, pyruvate is converted into carbon dioxide, water and energy in
    the mitochondria.
ii) Anaerobic respiration :- takes place in the absence of oxygen. It produces less
    energy. The end products are lactic acid or ethanol, carbon dioxide, and
    energy. It takes place in muscle cells and yeast. In anaerobic respiration in
    muscle cells, glucose is converted into pyruvate and in the absence of oxygen
    pyruvate is converted into lactic acid and energy. In anaerobic respiration in
    yeast, glucose is converted into pyruvate and in the absence of oxygen
    pyruvate is converted into ethanol, carbon dioxide and energy. This process
    is called fermentation.
respiration
The main organs of the respiratory system are nostrils, nasal
cavity, pharynx, larynx, trachea, bronchi, bronchioles, lungs
and diaphragm. Air enter through the nostrils. The hairs and
mucous traps the dust particles. It then passes through the
pharynx, larynx, trachea, bronchi and enters the lungs. The
trachea has rings of cartilage which prevents it from collapsing
when there is no air in the trachea. The bronchi divides into
smaller tubes called bronchioles which ends in tiny air sacs
called alveoli. The alveoli is supplied with blood vessels
through which exchange of gases takes place. The alveoli helps
to increase the surface area for the exchange of gases.
respiration
• Breathing is a continuous process that involves both
  inhalation and exhalation. The process of taking in oxygen-
  rich air is known as inhalation, while the process of releasing
  carbon dioxide-rich air into the atmosphere is known
  as exhalation. During inhalation, the diaphragm moves down
  and the ribs move upwards and outwards, thereby increasing
  the space in the chest cavity. This leads to the movement of
  air inside the lungs.
• During exhalation, the diaphragm moves to its former
  position and the ribs move downwards and inwards, thereby
  reducing the size of the chest cavity. This leads to the
  movement of air out of the lungs.
respiration
respiration

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respiration

  • 2. Respiration is the process by which food is burnt in the cells of the body with the help of oxygen to release energy. It takes place in the mitochondria of the cells. Respiration involves the exchange of gases and oxidation of food in the presence of air to release energy. Inhalation and exhalation of air occur due to change in air pressure in lungs .Diffusion helps in exchange of gases in lungs and tissues.
  • 3. There are two main types of respiration. They are aerobic and anaerobic respiration. i) Aerobic respiration :- Takes place in the presence of oxygen. It produces more energy. The end products are carbon dioxide, water and energy. It takes place in most organisms. In aerobic respiration glucose is converted into pyruvate in the cytoplasm in the presence of oxygen and then in the presence of oxygen, pyruvate is converted into carbon dioxide, water and energy in the mitochondria. ii) Anaerobic respiration :- takes place in the absence of oxygen. It produces less energy. The end products are lactic acid or ethanol, carbon dioxide, and energy. It takes place in muscle cells and yeast. In anaerobic respiration in muscle cells, glucose is converted into pyruvate and in the absence of oxygen pyruvate is converted into lactic acid and energy. In anaerobic respiration in yeast, glucose is converted into pyruvate and in the absence of oxygen pyruvate is converted into ethanol, carbon dioxide and energy. This process is called fermentation.
  • 5. The main organs of the respiratory system are nostrils, nasal cavity, pharynx, larynx, trachea, bronchi, bronchioles, lungs and diaphragm. Air enter through the nostrils. The hairs and mucous traps the dust particles. It then passes through the pharynx, larynx, trachea, bronchi and enters the lungs. The trachea has rings of cartilage which prevents it from collapsing when there is no air in the trachea. The bronchi divides into smaller tubes called bronchioles which ends in tiny air sacs called alveoli. The alveoli is supplied with blood vessels through which exchange of gases takes place. The alveoli helps to increase the surface area for the exchange of gases.
  • 7. • Breathing is a continuous process that involves both inhalation and exhalation. The process of taking in oxygen- rich air is known as inhalation, while the process of releasing carbon dioxide-rich air into the atmosphere is known as exhalation. During inhalation, the diaphragm moves down and the ribs move upwards and outwards, thereby increasing the space in the chest cavity. This leads to the movement of air inside the lungs. • During exhalation, the diaphragm moves to its former position and the ribs move downwards and inwards, thereby reducing the size of the chest cavity. This leads to the movement of air out of the lungs.